//dom

//Document Object Model-->html

//
//window.document
//

var getAllDivTags = document.getElementsByTagName('div');//array of all divs

var getMainContentDiv = document.getElementsByClassName('mainContent');//array

var headerEl = document.getElementById('header');
//[div(id header),div , div]
//
//document
//text
//nodeName
//nodeType
//style
